DE938147C - Organic pigments for lacquers and paints - Google Patents

Description

Organic pigments for lacquers and paints It was found that the heavy metal compounds of 2, 5-Dimerkapto-z, 3, 4-thiadiazole in excellent as pigments, e.g. B. in lacquer, printing, paint and painting technology, let use.

The mono and di-compounds of dimercaptothiadiols of iron, bismuth, copper, zinc, cadmium and, in particular, of lead are preferably suitable. They are obtained in a simple manner, e.g. B. by reacting aqueous solutions of the alkali salts of 2, _ @ - Dimerkapto-1, 3, 4-thiadiazole with water-soluble heavy metal salts (see. Reports, 27, pp. 2507 to 2511 [r894]). If desired, carriers can also be present during the precipitation. If you use. If more than the equivalent amount of the heavy metal salt, basic salts of 2,5-dimerkapto-1,3,4-thiadia7ol can also be produced by subsequent alkali treatment. Heavy metal salts, which already partially hydrolyze in aqueous solution, are advantageously used to form complexes with heavy metals; like mannitol, glycol or glycerin, too.

The pigments obtainable in this way are very light and oily. You let advantageous in the production of opaque paints., z. B. of Caseindeckfarben for the leather industry, which have very good overspray fastness. Against. They are alkali carbonates and acids such as sulfuric acid, acetic acid and tartaric acid good resistance. The lead compounds are also characterized by special good anti-rust properties; compared to the usual rust protection pigments, like red lead or lead cyanamide, they have the advantage of a lower lead content and a lower specific weight.

Suitable binders for the new pigments are, for example Linseed oil, linseed oil stand oil, wood oil, alkyd resins, kodlodium wodle or casein. Also plastics, such as polyvinyl chloride, polystyrene, Polyurethanes, polyamides, resins made of aromatic hydrocarbons and polyester, are suitable for this. With the The new pigments are well tolerated by common solvents. The pigments can therefore also in printing inks, for dyeing soap or paper in bulk, for spin dyeing of synthetic fibers, as pigments when printing with plastic binders, for dyeing used by plastics of all kinds.

The parts given in the examples are parts by weight. . example i Mix and then grind 15 parts of collodion wool in a funnel mill, 3 parts of camphor, 10 parts of di-butyl phthalate, 25 parts of ethyl acetate with 50 parts of methanol and zo parts of the lead salt of 2, 5-Dimerkapto-1, 3, 4-thiadiazole. A bright greenish-tinged yellow, viscous leather topcoat with very good results is obtained Authenticity properties. By adding. any amount of a collodion solvent the paint can also be used as a spray paint for metal surfaces in a low-viscosity solution be used.

If you mix iöo parts of a commercial casein solution in the funnel mill with 2o parts of lead salt of 2, 5-Dimerkapto-i, 3, 4-thiadiazole, one obtains one very valuable. Casein varnish.

Example 2 100 parts of a mixture of 18.9 parts of butanol-moist 35% nitrocellulose, 7.7 parts of butyl phthalate, 4 parts of cyclohexanone resin, 23 parts of butyl acetate containing 15% of butanol, 10 parts of ethyl acetate, 2 parts of toluene and 15.4 parts of Xylo.l are mixed with 5 parts of lead salt -des 2, 5-Dimerkapto-r, 3, 4 = thiadiazoles and ground well on a funnel mill. A yellow with good coverage is obtained. Lacquer with very good light and overspray fastness. If, instead of the 5 parts of the lead salt, only 3 parts of it and an additional 8 parts of zinc oxide are used, a pale yellow lacquer is obtained - with equally good properties - Example 1 3 - One mixes 100 parts. a low viscosity; Alkyd resins containing 5o% toluene with 8 parts of lead salt of 2, 5-Ditrierkaptö-1, 3, 4-thadiazole and ground -good- = on -the funnel mill. A yellow varnish that is easy to spread is obtained.

_ - Example 4 14o parts of naphthalene-formaldehyde resin, 3o parts of chlorinated paraffin, 185 parts of toluene and 25 parts of lead salt des 2, 5-Dimerkapto-z., 3; 4-thiadiazoles are ground well on the funnel mill. A well-covering, acid-resistant product is obtained yellow lacquer: Example 5 20 parts of barite and 50 parts of 10% aluminum sulfate solution are mixed; 25 parts of 10% strength sodium carbate solution and 4 parts of lead salt of 2,5-Dimerkapto-i; 3; 4-thiadiazoles and grind the mixture well on the hopper mill. 2o parts of this Mixture are mixed with 10 parts of a commercial glue solution and again Grind well on the funnel mill. A bright yellow wallpaper color is obtained. Example 6 27 parts of linseed oil are mixed with 70 parts of lead salt of 2,5-iDirnerkapto-z, 3, 4-thiadiazoles and 3 parts white spirit and ground well on the hopper grinder. A yellow anti-rust primer with very good properties is obtained. example 7 35 parts of a reaction product of 3 parts of linseed oil and one part of the condensation product from glycerine and the addition product of maleic anhydride to rosin with 35 parts of lead salt of 2, 5-Dimerkapto-i, 3, 4-thiadiazole and 3o parts of heavy gasoline mixed and ground well on the funnel grinder. You get an excellent one yellow anti-rust top coat. Example 8 15 parts of a vinyl chloride / vinyl isobutyl ether copolymer are mixed (Weight ratio of the monomers of about @ 3: i) with 5 parts of alkyd resin, 3 parts of a chlorinated diphenyl with 59% chlorine content, i part of cyclohexanone resin, 24 parts Lead salt of 2, 5-Dimerkapto-1,3-, 4-thiadiazöls and 52 parts of a solvent = medium mixture, that from ethyl acetate, butyl acetate, toluene, ethylene glycol monopropyl ether and gasoline in a ratio of 2: 1: 1: 1: 5. The mixture turns out fine on the hopper mill grind. A valuable yellow anti-rust varnish with good fastness properties is obtained.

Example Zoo parts of barite are mixed with 500 parts of an io% Aluminum sulphate solution, 25o parts of a 10% sodium carbonate solution and 25o Parts of water stirred. A neutralized solution is added to this mixture from zoo parts of water, 17 parts of 2, 5-Dimerkapto-i; 3, 4-thiadiazole and 9.1 parts Caustic soda and stir for another hour. Then you add with continued stirring a solution of 38.2 parts lead acetate in 2oo parts water, stir overnight and then sucks ah.

2o parts of the still moist yellow precipitate are mixed with io Divide a commercial glue solution and grind the mixture on the funnel mill. A bright yellow wallpaper color is obtained.

Claims (1)

PATENT CLAIMS: -Use. of heavy metal compounds of 2; 5-Dimerkapto-i, 3, 4-thadiazoles as pigments for varnishes and paints.